Method and apparatus for controlling an electric motor the rotat

Details Method and apparatus for controlling an electric motor the rotat Method and apparatus for controlling an electric motor the rotat

1983-10-19

1986-03-04

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318434, 318334, 318332, 318327, H02P 738

Patent

active

045742260

ABSTRACT:
A method and apparatus for controlling an electric motor, in particular a motor for driving hand tools, saws, and the like, the rotational speed of which is automatically reduced in no-load idling operation and increased when working under load to pre-determined speed values corresponding to desired working speeds. A current sensor picks up the current absorbed by the electric motor and causes the speed of the electric motor to be abruptly changed when a load condition has been detected. A timing relay maintains the electric motor at the higher working speed for a pre-determined period of time after termination of the operation under load. The threshold value of the sensitivity of the current sensor is raised simultaneously with the change-over to the higher working speed.

REFERENCES:
patent: 3950684 (1976-04-01), Peterson
patent: 4156162 (1979-05-01), Warfield et al.
patent: 4157491 (1979-06-01), Werner et al.
patent: 4288828 (1981-09-01), Kuntner et al.
patent: 4300079 (1981-11-01), Kawada et al.
patent: 4302713 (1981-11-01), Cutler et al.
patent: 4307325 (1981-12-01), Saar
patent: 4317176 (1982-02-01), Saar et al.
patent: 4410846 (1983-10-01), Gerber et al.

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